you have the cia involved in that, the fbi and the defense intelligence agency to try to be sure that these two did not have others that they were working with. that this, you know, is truly over. we just don't know that yet. >> and we will go straight to the president the minute we see him approach the podium. pierre thomas, you're listening? >> reporter: diane, one of the things that struck me about the press conference is, it reminded us of the sheer violence we saw this week. the bombing. mangled people. the police chief tonight talked about 200 rounds being fired in the exchange with the suspects last night. bombs being thrown, homemade grenades. and he used a word that we don't often hear, we've been hearing too often of late, that the m.i.t. police officer was assassinated. i think we first reported today that they walked up on that security officer, that police officer, fired on him and executed him in his car. >> and, again, the police said they could detect his presence. the suspect's presence from those helicopters, presumably? >> they can do that. the extraordinary thing,